BusyBenz:
I believe the magnet costs $3 to $4. You can get it from the dealer or add it to the your next order from FastLane (the button on top of this page). Personally, I used a flat refrigerator magnet that vendors often send in with junk mail. Be mindful of placing it in the pan away from electrical solenoids.

rjnonnie:
Yes, the writeup is generic and created by myself from experience. The basic principle applies, though a few details are different for MB vehicles, such as the drain plug (which did include a disclaimer) and the gasket (my E320 has a reusable gasket). Naturally, if you car has a drain plug for the torque converter these instructions are not needed and transmission fluid change is even simpler.

I've read other writeups where the person plumbs one line to the drain and the other to clean fluid and lets the entire charge exchange at once. It all depends on how much prep work and plumbing you want to do, and where you can tap into the plumbing. This is an even better way to exchange fluid as you suggest.

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95 E320 Cabriolet, 169K